{"id":92546,"date":"2020-08-28T07:42:57","date_gmt":"2020-08-28T05:42:57","guid":{"rendered":"https:\/\/prohoster.info\/blog\/novosti-interneta\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd"},"modified":"2020-08-28T07:42:57","modified_gmt":"2020-08-28T05:42:57","slug":"uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","status":"publish","type":"post","link":"https:\/\/prohoster.info\/cs\/blog\/news\/uyazvimost-v-openzfs-narushayushhaya-obrabotku-prav-dostupa-vo-freebsd","title":{"rendered":"Zranitelnost v OpenZFS naru\u0161uje zpracov\u00e1n\u00ed p\u0159\u00edstupov\u00fdch pr\u00e1v ve FreeBSD.","gt_translate_keys":[{"key":"rendered","format":"text"}]},"content":{"rendered":"

V p\u0159idan\u00e9m<\/a><\/noindex> v OpenZFS<\/a><\/noindex> k\u00f3du pro podporu opera\u010dn\u00edho syst\u00e9mu FreeBSD byla odhalena kritick\u00e1 zranitelnost<\/a><\/noindex> (CVE-2020-24717<\/a><\/noindex>), co\u017e vede k poru\u0161en\u00ed zpracov\u00e1n\u00ed pr\u00e1v p\u0159\u00edstupu. J\u00e1dro probl\u00e9mu spo\u010d\u00edv\u00e1 v tom, \u017ee pr\u00e1va nastaven\u00e1 pro skupinu byla zpracov\u00e1v\u00e1na jako pr\u00e1va vlastn\u00edka souboru. Probl\u00e9m odstran\u011bna<\/a><\/noindex> v aktualizaci OpenZFS 2.0.0-rc1<\/a><\/noindex>. Oprava byla p\u0159id\u00e1na<\/a><\/noindex> do p\u0159ekladu<\/a><\/noindex> k\u00f3du z FreeBSD HEAD na OpenZFS.<\/p>\n

Probl\u00e9m byl zp\u016fsoben t\u00edm, \u017ee v\u0161echny prvky seznamu \u0159\u00edzen\u00ed p\u0159\u00edstupu (ACE) nastaven\u00e9 pro vlastn\u00edka skupiny (group@) a b\u011b\u017en\u00e9 skupiny (group:<jm\u00e9no>) byly delegov\u00e1ny aktu\u00e1ln\u00edmu u\u017eivateli.
\nNap\u0159\u00edklad p\u0159\u00edstupov\u00fd re\u017eim 0770 (z\u00e1pis povolen pouze pro \u010dleny skupiny) byl zpracov\u00e1v\u00e1n jako 0777 (z\u00e1pis povolen pro v\u0161echny u\u017eivatele). Podobn\u00e1 situace byla pozorov\u00e1na s ACL, nap\u0159\u00edklad n\u00ed\u017ee uveden\u00fd ACL se stal ekvivalentn\u00edm pr\u00e1v\u016fm 0777, proto\u017ee kontrola \u010dlena skupiny pro builtin_administrators vrac\u00ed hodnotu True.<\/p>\n

# owner: root
\n # group: wheel
\n skupina:builtin_administrators:rwxpDdaARWcCos:\u2014\u2014-:povolit<\/p>\n

V portu OpenZFS pro FreeBSD byla tak\u00e9 odhalena dal\u0161\u00ed probl\u00e9m s poskytov\u00e1n\u00edm pr\u00e1v na p\u0159echod do adres\u00e1\u0159e (cd), a to bez ohledu na stav povolen\u00ed pro vykon\u00e1v\u00e1n\u00ed v adres\u00e1\u0159\u00edch. Vstup do adres\u00e1\u0159e byl mo\u017en\u00fd i p\u0159i v\u00fdslovn\u00e9m z\u00e1kazu prost\u0159ednictv\u00edm ACL (\u201ezak\u00e1zat - vykon\u00e1vat\u201c). <\/p>\n

<\/a><\/noindex><\/p>\n

Zdroj: opennet.ru<\/a><\/p>","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"excerpt":{"rendered":"

\u0412 \u0434\u043e\u0431\u0430\u0432\u043b\u0435\u043d\u043d\u043e\u043c \u0432 OpenZFS \u043a\u043e\u0434\u0435 \u0434\u043b\u044f \u043f\u043e\u0434\u0434\u0435\u0440\u0436\u043a\u0438 \u041e\u0421 FreeBSD \u0432\u044b\u044f\u0432\u043b\u0435\u043d\u0430 \u043a\u0440\u0438\u0442\u0438\u0447\u0435\u0441\u043a\u0430\u044f \u0443\u044f\u0437\u0432\u0438\u043c\u043e\u0441\u0442\u044c (CVE-2020-24717), \u043f\u0440\u0438\u0432\u043e\u0434\u044f\u0449\u0430\u044f \u043a \u043d\u0430\u0440\u0443\u0448\u0435\u043d\u0438\u044e \u043e\u0431\u0440\u0430\u0431\u043e\u0442\u043a\u0438 \u043f\u0440\u0430\u0432 \u0434\u043e\u0441\u0442\u0443\u043f\u0430. \u0421\u0443\u0442\u044c \u043f\u0440\u043e\u0431\u043b\u0435\u043c\u044b \u0432 \u0442\u043e\u043c, \u0447\u0442\u043e \u043f\u0440\u0430\u0432\u0430, \u0443\u0441\u0442\u0430\u043d\u0430\u0432\u043b\u0438\u0432\u0430\u0435\u043c\u044b\u0435 \u0434\u043b\u044f \u0433\u0440\u0443\u043f\u043f\u044b, \u043e\u0431\u0440\u0430\u0431\u0430\u0442\u044b\u0432\u0430\u043b\u0438\u0441\u044c \u043a\u0430\u043a \u043f\u0440\u0430\u0432\u0430 \u0434\u043b\u044f \u0432\u043b\u0430\u0434\u0435\u043b\u044c\u0446\u0430 \u0444\u0430\u0439\u043b\u0430. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0443\u0441\u0442\u0440\u0430\u043d\u0435\u043d\u0430 \u0432 \u043e\u0431\u043d\u043e\u0432\u043b\u0435\u043d\u0438\u0438 OpenZFS 2.0.0-rc1. \u0418\u0441\u043f\u0440\u0430\u0432\u043b\u0435\u043d\u0438\u0435 \u0432\u043d\u0435\u0441\u0435\u043d\u043e \u0434\u043e \u043f\u0435\u0440\u0435\u0432\u043e\u0434\u0430 \u043a\u043e\u0434\u043e\u0432\u043e\u0439 \u0431\u0430\u0437\u044b FreeBSD HEAD \u043d\u0430 OpenZFS. \u041f\u0440\u043e\u0431\u043b\u0435\u043c\u0430 \u0431\u044b\u043b\u0430 \u0432\u044b\u0437\u0432\u0430\u043d\u0430 \u0442\u0435\u043c, \u0447\u0442\u043e […]<\/p>\n","protected":false,"gt_translate_keys":[{"key":"rendered","format":"html"}]},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[702],"tags":[],"class_list":["post-92546","post","type-post","status-publish","format-standard","hentry","category-news"],"aioseo_notices":[],"aioseo_head":"\n\t\t\n\t\n\t\n\t\n\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\t\t\n\n","aioseo_head_json":{"title":"\ud83e\udd47Zranitelnost v OpenZFS naru\u0161uj\u00edc\u00ed zpracov\u00e1n\u00ed pr\u00e1v p\u0159\u00edstupu ve FreeBSD | ProHoster","description":"V p\u0159idan\u00e9m k\u00f3du OpenZFS 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